Cooling System (cont’d)
4 Attach a radiator tester and increase the pressure to
12.8 psi (0.9 kg / cm
2
). (fig. C172) Inspect the radiator,
hoses and engine block for external leaks. Repair as
required.
5 Attach a radiator tester to the radiator cap. (fig.
C173) Apply 12.8 psi (0.9 kg / cm
2
) pressure to the radia-
tor cap. The pressure should not drop more than 4.3 psi
(0.3kg / cm
2
) in 10 seconds. Replace the radiator cap if
required.
If no external leaks are found, and the radiator cap tests
good, there may be an internal problem with the engine
such as a gasket, cylinder head or block defect. Consult a
Kubota Repair Manual P / N 40916 (Kubota P / N 97897-
0109-5) to assist in engine disassembly and inspection.
Coolant Replacement:
The engine coolant should be changed every 1000 hours
of operation. To change the coolant:
Park the loader on a level surface, lower the boom arms,
engage the parking brake and shut off the engine.
1 Make sure the engine is not hot to touch. Remove the
radiator cap.
2 Remove the radiator drain plug located on the bottom
of the radiator. (fig. C5645, C5646) Be prepared to con-
tain 1.8 gal (7 liters) of fluid.
3 Open the engine drain petcock located under the fuel
pump. (fig. C5647) To access this drain petcock, you
may have to remove the bolts that fasten the fuel filter to
the frame and hold the filter to one side as you reach in to
open the petcock.
Close the drain petcock after the engine is completely
drained. Re-fasten the filter to the frame.
Note: Attaching a piece of 5 / 16” (8mm) hose to the
drain petcock and routing to a container, lessens waste
and fluid clean up. Please dispose of waste fluid in an
environmentally friendly manner.
4 Close the radiator drain.
5 Pre - mix the engine coolant, ethylene glycol, to
equal parts of water. (50 / 50 ratio) Add the mixed coolant
to the engine radiator.The cooling system will hold
approximately 1.8 gal (7 liter) for the 85. Never use
coolant undiluted. Pure coolant does not absorb and pass
heat efficiently. It will also gel in cold weather.
7-9
7
ENGINE MAINTENANCE 7.1
WARNING
Do not remove the radiator cap when the engine is
hot.
C5645
C173
C172
Pressurizing the
cooling system
Radiator cap test
Radiator drain
up to S/N
LB003381
C5646
Radiator drain
S/N LB003382
onward
C5647
Block drain
Fuel pump
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